| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_BUFFER_HUB_EVENT_FD_H_ |
| #define ANDROID_BUFFER_HUB_EVENT_FD_H_ |
| |
| #include <android-base/unique_fd.h> |
| #include <utils/Errors.h> |
| |
| namespace android { |
| |
| class BufferHubEventFd { |
| public: |
| /** |
| * Constructs a valid event fd. |
| */ |
| BufferHubEventFd(); |
| |
| /** |
| * Constructs from a valid event fd. Caller is responsible for the validity of the fd. Takes |
| * ownership. |
| */ |
| BufferHubEventFd(int fd); |
| |
| /** |
| * Returns whether this BufferHubEventFd holds a valid event_fd. |
| */ |
| bool isValid() const { return get() >= 0; } |
| |
| /** |
| * Returns the fd number of the BufferHubEventFd object. Note that there is no ownership |
| * transfer. |
| */ |
| int get() const { return mFd.get(); } |
| |
| /** |
| * Signals the eventfd. |
| */ |
| status_t signal() const; |
| |
| /** |
| * Clears the signal from this eventfd if it is signaled. |
| */ |
| status_t clear() const; |
| |
| private: |
| base::unique_fd mFd; |
| }; |
| |
| } // namespace android |
| |
| #endif // ANDROID_BUFFER_HUB_EVENT_FD_H_ |